Nanno the Abakos

Nanno the Abakos (died c. 420s BCE) was a Greek mercenary who operated during the Peloponnesian War.

Biography
With Nanno's love of mathematics, her parents saw her future in an Athenian treasury. However, instead of counting drachmae, she counted her number of kills. She kept track of them on her personal abacus as she traveled across the Greek world.